Wafer processing method for dividing a wafer along division lines
US10985066B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2019 |
| Grant date | Apr 20, 2021 |
| Priority date | — |
| Expiry date | Aug 29, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2221/68327
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A wafer processing method includes a polyolefin sheet providing step of positioning a wafer in an inside opening of a ring frame and providing a polyolefin sheet on a back side of the wafer and on a back side of the ring frame, a uniting step of heating the polyolefin sheet as applying a pressure to the polyolefin sheet to thereby unite the wafer and the ring frame through the polyolefin sheet by thermocompression bonding, a dividing step of cutting the wafer by using a cutting apparatus to thereby divide the wafer into individual device chips, and a pickup step of applying an ultrasonic wave to the polyolefin sheet, pushing up each device chip through the polyolefin sheet, and then picking up each device chip from the polyolefin sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.